source: openpam/trunk/lib/liboath/oath_key_from_file.c @ 786

/*-
 * Copyright (c) 2013 Universitetet i Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: oath_key_from_file.c 786 2014-03-10 15:37:55Z des $
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <sys/types.h>

#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>

#include <security/pam_appl.h>
#include <security/openpam.h>

#include "openpam_strlcmp.h"

#include <security/oath.h>

/*
 * OATH
 *
 * Loads an OATH key from a file
 */

struct oath_key *
oath_key_from_file(const char *filename)
{
        struct oath_key *key;
        FILE *f;
        char *line;
        size_t len;

        if ((f = fopen(filename, "r")) == NULL)
                return (NULL);
        /* get first non-empty non-comment line */
        line = openpam_readline(f, NULL, &len);
        if (strlcmp("otpauth://", line, len) == 0) {
                key = oath_key_from_uri(line);
        } else {
                openpam_log(PAM_LOG_ERROR,
                    "unrecognized key file format: %s", filename);
                key = NULL;
        }
        fclose(f);
        return (key);
}

/**
 * The =oath_key_from_file function loads a key from the specified file.
 * The file format is automatically detected.
 *
 * The following key file formats are supported:
 *
 *  - otpauth URI
 *
 * Keys created with =oath_key_from_file must be freed using
 * =oath_key_free.
 *
 * >oath_key_alloc
 * >oath_key_free
 * >oath_key_from_uri
 *
 * AUTHOR UIO
 */